Lenox 50677201 Installing New Indoor Metering Device, Indoor Expansion Valve Installation

Models: 50677201 Elite Series XP14 Units HEAT PUMPS

1 32
Download 32 pages 14.37 Kb
Page 16
Image 16

Installing New Indoor Metering Device

This outdoor unit is designed for use in HFC−410A systems that use a check / expansion valve metering device (purchased separately) at the indoor coil.

See the Lennox XP14 Engineering Handbook for approved check / expansion valve kit match−ups. The check / expansion valve device can be installed either internal or external to the indoor coil. In applications where an uncased coil is being installed in a field−provided plenum, install the check / expansion valve in a manner that will provide access for field servicing of the check / expansion valve (see figure 12).

INDOOR EXPANSION VALVE INSTALLATION

TWO PIECE

 

(Uncased Coil Shown)

 

PATCH PLATE

 

 

(UNCASED

 

 

 

STUB

 

 

COIL ONLY)

LIQUID LINE

CHECK /

 

END

 

 

 

ORIFICE

 

 

 

 

 

 

 

 

 

 

EXPANSION

 

 

 

HOUSING

 

DISTRIBUTOR

 

 

VALVE

 

 

 

 

 

 

TUBES

 

 

 

 

 

TEFLON®

 

 

 

 

 

 

 

 

 

 

 

 

RING

 

 

 

 

TEFLON®

 

SENSING

 

 

 

 

RING

 

 

 

 

 

 

LINE

 

 

 

 

 

 

DISTRIBUTOR

 

EQUALIZER

 

 

ASSEMBLY

 

 

LINE

 

 

 

 

 

 

 

LIQUID LINE

ARemove the field−provided fitting that temporarily reconnected the liquid line to the indoor unit’s distributor assembly.

BInstall one of the provided Teflon® rings around the stubbed end of the check / expansion valve and lightly

lubricate the connector threads and expose surface of the Teflon® ring with refrigerant oil.

CAttach the stubbed end of the expansion valve to the liquid line orifice housing. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above, or 20 ft−lb.

DPlace the remaining Teflon® washer around the other end of the check / expansion valve. Lightly lubricate connector threads and expose surface of the Teflon® ring with refrigerant oil.

EAttach the liquid line assembly to the check / expansion valve. Finger tighten and use an appropriately sized wrench to turn an additional 1/2 turn clockwise as illustrated in the figure above or 20 ft−lb.

1/2 Turn

11 12

1

10

 

2

9

 

43

8 7

6

5

ASSEMBLY WITH

BRASS NUT

SENSING BULB INSTALLATION

MALE EQUALIZER LINE

VAPOR

FITTING (SEE

LINE

EQUALIZER LINE

 

INSTALLATION FOR

LIQUID LINE

FURTHER DETAILS)

 

Sensing bulb insulation is required if mounted external to the coil casing.

AAttach the vapor line sensing bulb in the proper orientation as illustrated to the right using the clamp and screws provided.

NOTE

and expansion bulb before insulating the sensing bulb once installed.

BConnect the equalizer line from the check / expansion valve to the equalizer vapor port on the vapor line. Finger tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated below.

 

1/8 Turn

 

11 12

1

10

 

2

9

 

 

43

8

7

6

5

EQUALIZER LINE INSTALLATION

Remove and discard either the flare seal cap or flare nut with copper flare seal bonnet from the equalizer line port on the vapor line as illustrated in the figure to the right.

VAPOR LINE

ON LINES SMALLER THAN

7/8", MOUNT SENSING

 

BULB AT EITHER THE 3 OR

 

9 O’CLOCK POSITION.

 

12

BULB

BULB

FLARE SEAL CAP

OR

FLARE NUT

VAPOR LINE

 

 

 

 

 

ON 7/8" AND LARGER LINES,

 

 

MOUNT SENSING BULB AT

COPPER FLARE

 

EITHER THE 4 OR 8 O’CLOCK

SEAL BONNET

12

POSITION. NEVER MOUNT ON

 

BOTTOM OF LINE.

MALE BRASS EQUALIZER

BULB

BULB

LINE FITTING

 

 

 

VAPOR LINE

NOTE OM OF LINE.

 

Figure 12. Installing Indoor Check / Expansion Valve

506728−01

Page 16

Page 16
Image 16
Lenox 50677201 Installing New Indoor Metering Device, Indoor Expansion Valve Installation, Uncased Coil Shown